public class Main {
    public static void main(String[] args) {
/*        if(布尔表达式){
            语句1;
        }else if{
            语句2;
        }else{
            语句3;
        }*/
        if(score >= 90){
            System.out.println("优秀");
        }else if(score >= 80 && score < 90){
            System.out.println("良好");
        }else if(score >= 70 && score < 80){
            System.out.println("中等");
        }else if(score >= 60 && score < 70){
            System.out.println("及格");
        }else if(score >= 0 && score < 60){
            System.out.println("不及格");
        }else{
            System.out.println("错误数据");
        }
    }
}
